This scientific calculator is designed with a protection cover to protect keys from wearing and tearing. With 240 computing functions: include fractions, statistics, complex number calculations, linear regression, base arithmetic, etc. Made of high-grade ABS to improve the overall texture, and passed 1.2M drop test. The foldable desktop calculator is equipped with an ergonomic magnetic hidden stylus on the bottom side of the flip place, which allows you to write or draw bright and clear lines. Not easy to lose, you can calculate and record at any time. Just press the erase button once after use, help to reduce paper consumption, and achieve the goal of environmental protection. 2 line large viewing angle LCD display makes calculations more convenient and fast, supports 12-digits calculations and with 10 data output. 6 inches large screen writing board with LCD handwriting film enables smooth picture and without rubbing noise when you are writing. Powered by 1 x 170mAhbattery, no need to recharge, it can be used for about one year. Adopt premium silicone material 50 keys, which is comfortable to touch, more sensitive, wear-resistant and more precise. A slide lock botton is designed on the bottom of the calculator, when you writing with the wirting tablet, using lock button to prevent accidental deletion and lock the screen. color:Black Material: silicone, + plastic Package Contents: 1 x calculator Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.